An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19…
Priority MEDIUM 44CWE-502Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-502.
Summary
An issue was discovered in OpenNMS Horizon before 26.0.1, and Meridian before 2018.1.19 and 2019 before 2019.1.7. The ActiveMQ channel configuration allowed for arbitrary deserialization of Java objects (aka ActiveMQ Minion payload deserialization), leading to remote code execution for any authenticated channel user regardless of its assigned permissions.
Why it matters now
EPSS 0.03456 89th percentileScored 2026-11-07
Fix Fixed org.opennms.core:org.opennms.core.daemon (Maven): 26.0.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | org.opennms.core:org.opennms.core.daemon (Maven) | before 26.0.1 | 26.0.1 | Patch available | GHSA-853f-x27w-8r74 |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- org.opennms.core:org.opennms.core.daemon (Maven) Vendor— Affected before 26.0.1 Fixed in 26.0.1 Patch available GHSA-853f-x27w-8r74
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:opennms:opennms_horizon:*:*:*:*:*:*:*:* | before 26.1.0 | Vulnerable | The OpenNMS Group |
| cpe:2.3:a:opennms:opennms_meridian:*:*:*:*:*:*:*:* | before 2018.1.19; 2019 to before 2019.1.7 | Vulnerable | The OpenNMS Group |
- cpe:2.3:a:opennms:opennms_horizon:*:*:*:*:*:*:*:* Versions before 26.1.0 Vulnerable ·The OpenNMS Group
- cpe:2.3:a:opennms:opennms_meridian:*:*:*:*:*:*:*:* Versions before 2018.1.19; 2019 to before 2019.1.7 Vulnerable ·The OpenNMS Group
Remediation
- Fix · GHSA-853f-x27w-8r74 org.opennms.core:org.opennms.core.daemon (Maven) Fixed in 26.0.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-12760
- 2026-10-03 Alias added: GHSA-853f-x27w-8r74
References
Advisory 5
- https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released/
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released/
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released/
- https://issues.opennms.org/browse/NMS-12673
- https://nvd.nist.gov/vuln/detail/CVE-2020-12760
Other 7
- https://github.com/OpenNMS/opennms/releases/tag/opennms-26.0.1-1
- https://github.com/OpenNMS/opennms/pull/2983
- https://github.com/OpenNMS/opennms/commit/e21fc14ce355533493da0db815bd81a66e291382
- https://github.com/OpenNMS/opennms
- https://www.opennms.com/en/blog/2020-04-29-opennms-horizon-26-0-1-luchador-released
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2018-1-18-wildfire-released
- https://www.opennms.com/en/blog/2020-04-29-opennms-meridian-2019-1-6-europa-released
Sources
- CVE-2020-12760 · CVE Program
- CVE-2020-12760 · NVD
- FIRST EPSS
- GHSA-853f-x27w-8r74 · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences